Leu-enkephalin analogues containing a ureylene bond instead of an amide bond were synthesized. The ureylene bond was formed by a coupling reaction of the isocyanate derived from the corresponding azide by Curtius rearrangement reaction. Three analogues, each of which has a ureylene bond at the Tyr-Gly or Gly-Gly or Phe-Leu amide bond, were prepared. The ureylene bond resisted enzymatic hydrolysis, but the biological activities of the synthetic peptides on guinea pig ileum and mouse was deferens were low compared with those of Leu-enkephalin.
我们合成了含有
脲键而非
酰胺键的亮
烯酮类似物。
脲烯键是由相应
叠氮化物中的
异氰酸酯通过库尔提斯重排反应偶联生成的。制备了三种类似物,每种都在 Tyr-Gly、Gly-Gly 或 Phe-Leu
酰胺键上有一个
脲烯键。
脲烯键可抗酶
水解,但合成肽在豚鼠回肠和小鼠输精管上的
生物活性低于Leu-enkephalin。